<template>
  <div>
    <!--    面包屑区域-->
    <el-breadcrumb  separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
<!--    卡片视图区域-->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
          show-icon
          :closable="false"
          title="注意：只允许为第三级分类设置相关参数"
          type="warning">
      </el-alert>
<!--      选择商品分类区域-->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
              v-model="selectedCateKeys"
              :options="cateList"
              :props="cateProps"
              @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
<!--      tab页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--        添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
              type="primary"
              size="mini"
              :disabled="isBtnDisabled"
              @click="addDialogVisible = true">
            添加参数
          </el-button>
<!--          动态参数表格-->
          <el-table :data="manyTableDate" border stripe>
<!--            展开行-->
            <el-table-column type="expand">
              <template v-slot="scope">
<!--                循环渲染tag标签-->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
<!--                输入的文本框-->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
<!--                添加按钮-->
                <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)">
                  + New Tag
                </el-button>
              </template>
            </el-table-column>
<!--            索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                    size="mini"
                    type="primary"
                    icon="el-icon-edit"
                    @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button
                    size="mini"
                    type="danger"
                    icon="el-icon-delete"
                    @click="removeParams(scope.row.attr_id)">
                  删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
<!--        添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button
              type="primary"
              size="mini"
              :disabled="isBtnDisabled"
              @click="addDialogVisible = true">
            添加属性
          </el-button>
          <!--静态参数表格-->
          <el-table :data="onlyTableDate" border stripe>
            <!--            展开行-->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!--                循环渲染tag标签-->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClose(i,scope.row)">
                  {{item}}
                </el-tag>
                <!--                输入的文本框-->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--                添加按钮-->
                <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)">
                  + New Tag
                </el-button>
              </template>
            </el-table-column>
            <!--            索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                    size="mini"
                    type="primary"
                    icon="el-icon-edit"
                    @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button
                    size="mini"
                    type="danger"
                    icon="el-icon-delete"
                    @click="removeParams(scope.row.attr_id)">
                  删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

<!--    添加参数的对话框-->
    <el-dialog
        :title="`添加：${titleText}`"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-width="100px"
               class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>
<!--修改参数的对话框-->
    <el-dialog
        :title="`修改：${titleText}`"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
      <el-form :model="editForm"
               :rules="editFormRules"
               ref="editFormRef"
               label-width="100px"
               class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: "Params",
    data() {
      return {
        // 商品分类列表
        cateList: [],
        // 级联选择框的配置对象
        cateProps: {
          expandTrigger: 'hover' ,
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        //级联选择框双向绑定到的数组
        selectedCateKeys: [],
        //被激活页签的名称
        activeName: 'many',
        //动态属性的数据
        manyTableDate: [],
        //静态属性的数据
        onlyTableDate: [],
        //控制添加对话框的显示与隐藏
        addDialogVisible: false,
        //添加参数表单的数据对象
        addForm: {
          attr_name: ''
        },
        //添加表单的验证规则对象
        addFormRules: {
          attr_name: [{
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }]
        },
        //控制修改对话框的显示与隐藏
        editDialogVisible: false,
        //修改的表单数据对象
        editForm: {},
        editFormRules: {
          attr_name: [{
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }]
        },
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {data:res} = await this.$http.get('categories')

        if (res.meta.status !== 200) {
          return this.$message.error('获取分类参数失败')
        }
        this.cateList = res.data
      },
      handleChange() {
        this.getParamsData()
      },
      //tab 页签点击事件的处理函数
      handleTabClick() {
        this.getParamsData()
      },
      //获取参数列表数据
      async getParamsData() {
        //证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableDate = []
          this.onlyTableDate = []
          return null
        }
        //根据所选分类的id获取所处面板，获取对应的参数
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params: {sel: this.activeName}
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          //控制文本框的显示与隐藏
          item.inputVisible = false
          //文本框输入的值
          item.inputValue = ''
        })
        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableDate = res.data
        }else {
          this.onlyTableDate = res.data
        }
      },
      //监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      //点击按钮添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return null
          const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      //点击按钮展示修改对话框
      async showEditDialog(attr_id) {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
          params: {attr_sel: this.activeName}
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败！')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //重置修改的表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮修改信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return null
          const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })

          if (res.meta.status !== 200) {
            return this.$message.error('修该参数失败！')
          }
          this.$message.success('修该参数成功！')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      // 根据Id删除对应的参数项
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm(
            '此操作将永久删除该参数, 是否继续?',
            '提示',
            {
              confirmButtonText: '确定',
              cancelButtonText: '取消',
              type: 'warning'
            }
        ).catch(err => err)

        // 用户取消了删除的操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const { data: res } = await this.$http.delete(
            `categories/${this.cateId}/attributes/${attr_id}`
        )

        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')
        this.getParamsData()
      },
      //文本框失去焦点，或者按下回车键都会触发
      handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return null
        }
        //如果没有return，则证明输入的内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        this.saveAttrVals(row)
      },
      showInput(row) {
        row.inputVisible = true
        //让文本框自动获得焦点
        //$nextTick 方法作用，就是当页面上元素被重新渲染后，才会执行回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      //删除对应的参数可选项
      handleClose(i, row) {
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      },
      async saveAttrVals(row) {
        //需要发起请求保存这次操作
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项成功！')
      }
    },
    computed: {
      //如果按钮需要被禁用，返回true否返回false
      isBtnDisabled() {
        return this.selectedCateKeys.length !== 3;
      },
      //当前选中的三级分类Id
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      //动态计算标题的文本
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style scoped>
  .cat_opt {
    margin: 15px 0;
  }
  .el-tag{
    margin:0 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>